/* 基类 */
html,
body {
    width: 100%;
    height: 100%;
}

html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
caption,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: normal;
}
ol,ul,dl {
    list-style: none;
}
a {
    text-decoration: none;
    cursor: pointer;
}

/* 公类 */
/* 清除浮动 */
.clearfix::before,.clearfix::after {
    content: '';
    display: block;
    visibility: hidden;
    height: 0;
    line-height: 0;
    clear: both;
}
.clearfix {
    *zoom:1;
}

/* 浮动 */
.fl {
    float: left;
}
.fr {
    float: right;
}

/* 版心布局 */
.center {
    width: 1200px;
    margin: 0 auto;
    box-sizing: border-box;
}